I am thinking of replacing my sand and was thinking of using filter glass from BrightLine Media. What are your thoughts on glass (recycled galss) media? You installed my 18×36 pool in 2006 and I have the paperwork to know it is a Pentair Sand Dollar filter but I cannot find a model number. What model did you install? I am thinking SD60 or SD80 but like I said, my owners manual is general for the line and doesn’t give a specific and I couldn’t locate it on the filter (perhaps it was a decal that is now long gone).